Transmission and change speed mechanism



July 7, 1936. R RlLEY l 2,046,428

TRANSMISSION AND CHANGE SPEED MECHANISM Filed July 10, 1955 3 Sheets-Sheet l Flg- 19 '1911 19k 19e 18 23 20 20ev Ms /13 22 20h 15 Igf 17 20f Lv I July 7, 1936.

Filed July 1o, 1935 s sheets-sheet 2v ll N @wm m 7. Nm S mud Emmfl Q E WM. n.. m. J ww wm wu ma r e wm P f. ||Q E m n N u i mm e 4 NW v o m Nm, mm .n O MQ] \\\Q m nl mm om, NM uw. nm

July 7,V 1936. P. R|| EY 2,046,428

TRANSMISSION AND CHANGE SPEED MECHANISM- 3 Sheets-Sheet 3 Mm@ +Mw/MA1 rameau, 1, 192.6

PATENT oFF'lcE 2,043,428 mANsmssroN Asn omen eraan Mscnmsm Percy Riley, Coventry, England- 'Application .my 1o. 193s. semi No. 30,672

m Great Brunn .im as. 1934 comms. (ci. 'i4-33o) This invention relates to change-speed mechanism, particularly for motor-vehicles, of the kind having co-axial shafts, a parallel layshaft, three constantly-meshed gear-pairs of which some of thel gears are free, and two clutching systems through the operation of which four forward speeds can be obtained. TheA main object of the present invention is to provide a robust gear-box of this kind in which the gear-pairs are very. adequately supported, thus to ensure silence when running, and with which gear changing will be a very easy matter and can in all conditions be effected silently.

Now, according to one feature of the present i5 invention, the three gear-pairs are arranged adjacent one another and between the two clutching systems. In this case each of the clutching systems can be arranged beyond one end of the layshaft so that it need not be restricted as to 2o size. Consequently silent engagement for all "speeds can be obtained without the use of any main clutch externally of the gear-box..

vThe invention further consists, for'a motor- I vehicle, of a change-speed mechanism, of the kind referred to, where the clutching system at the driving end is adapted as the main friction clutch of the vehicle.

According to a further, feature of the invention, either or both of the clutching systems is hydraulically controlled.

In the accompanying drawings:-

Figure 1 is a diagrammatic representation of one form of change-speed mechanism according to the invention, the two double-acting clutching systems being both shown in the neutral position; Figure 2 is a part-sectional elevation of a combined clutch and change-speed mechanism for a motor-vehicle, and of the control thereof, adapted according to the invention, both clutching systems and the control mechanism being shown in the neutral position; Figure 3 is an end elevation thereof'taken substantially upon the line III-III of Figure 2:'

Figure 4 is a plan, mainly of the control means. the actuating piston and valve for one of the clutching systems being shown in section;

. Figures y5 and 6 are end elevations taken mainly on the lines V-V and VI-VI,- respectively, of .1v-Figure 3"or Figure 4;

.50`1 Figure. 'I is a section taken mainly on the line j of Figure 2; and

" "Figure is a plan of the gate for the gear lever.

Like. numerals indicate like parts throughout.

the drawings. I `3 the construction of Figure 1, an intermediate shaft I3 is spigotally mounted in the ends of the co-axial driving and driven shafts, Il, I5, respectively. Between its ends it carries two free sleeves I6, I1 on opposite sides of a gear I8 that is fast on it. These sleeves can be directly clutched, respectively, to the driving and driven shafts by means of separate and independent double-acting friction clutch systems I 9, 2li, respectively. Each of these friction clutch systems, which is very diagrammatically illustrated, is shown as com- 10 prising combined synchronizing and dog clutches.

.The clutch I9 comprises a casing I9a having a hub I9b splined on the drive shaft. I4 and a toothed clutch element I9c is carried' by the inside of the casing I 9a and is disposed between a clutch 15 element iSd and ISe secured to the intermediate shaft `I3 and the sleeve I6, respectively. The clutch element I9d has a toothed clutch portion' I9] and a truncated friction clutch portion |89, and the clutch element I9e has a similar toothed o clutch portion I9h and a truncated friction clutch portion i9i. Frictional clutch members |91' and I9lc are disposed inside the casing, and are connected together in the manner shown in Fig. 2 sothat when the casing lila is moved longitudinally ofthe shaft I4 in one direction the -frictional element |93' will initially contact with the truncated face of the clutch member ISd and. stop rotation of this member I9d so that the toothed clutch member I9c may engage the toothed clutch member I9f without clashing of A the eeth. .i v

e clutch 20 is similar in every respect to the clutch I9, and comprises -a casing 20a which has a hub 20h splined onto the driven shaft I5 and a 35 toothed clutch member 20c on theinside thereof.

A clutch member 20d is secured to the intermediate shaft I3 at one side of the clutch member 20c and comprises a toothed clutch portion 20e and a truncated friction clutch portion 2M. The 40 clutch member 20g is i'lxedto'the sleeve I1 at the opposite side of the clutch member 20c and comprises a toothed clutch portion 20h, and a truncated clutch portion 201. Frictional clutch members 20j and 20k are disposed within the 45 casing 20a.' and are adapted to selectively engage the frictional clutch portions 20f and 2M, respectively. These clutch members 209' and 20k, as shown in Fig. 2 are secured together, being secured to avrod 201, and spring-pressed balls 20m 50 and 2011. operate to move the clutch members 201 and 20k with the casing 20a. The driven shaft I5 is provided' with spaced apartl recesses 20o and the ball 20m is adapted to engage in lone of these recesses upon movement of the casing 20a and' 55 to thereby. hold the casing a in the selected clutching position. The clutch 20 operates in the same manner as the clutch I9, in that, as viewed in Fig. 1, movement of the casing 420a to the left will initially effect engagement of the frictional clutching elements 201 and 20k so as to stop rotation of the sleeve I1 and permit smooth engagement of the toothed clutch members 20c and 20h. In this manner the driven shaft Il will be coupled to the sleeve I1.

The two double-acting friction clutch systems, directly clutch the driving shaft to the intermediate shaft and the intermediate shaft to the. driven shaft, respectively. In these latter conditions top or fourth "speed is obtained, this y providing a direct drive. (Owing to the connections hereinafter described, in direct drive the sleeve I1 runs idly and the sleeve IB would also run idly if it were not disconnected by the oneway driving clutch 2| hereinafter referred to.)

The sleeves I6 and |1 have fast on them gears 22, 23, respectively alongside the gear I8, and the gears 22, 23 are in permanent mesh with gears 24. 25 on the layshaft 26, this also having a third gear 21 in permanent mesh with the gear Il on the intermediate shaft. .The gear 24 is not fast on the layshaft 26 but is coupled therewith through the clutch 2|. This clutch drives when the sleeve I6 is to drive through the layshaft and overruns when the drive would be otherwise.

Second speed" is obtained by driving direct to the intermediate'shaft I8 (as in the case of fourth speed), from there to the layshaft 28 by the gears I8, 21, and thence to the driven shaft by way of the gears 25, 22 and the sleeve I1. (During this the clutch 2| is not driving, as previously stated as the gear 21 and the layshaft 2B are rotating faster than the gear 24 so that the clutch 2| will overrun.)

For third and first speeds the double-acting clutch system I9 is moved to the position in which the sleeve I6 is directly connected to the driving `shaft. For'third speed the drive is taken from the sleeve I6 to the layshaft by the gear pair 22, 24 and thence through the gears 21, I8 to the intermediate shaft which is directly connected by vthe other double-acting clutch system 20 to the driven shaft. In these conditions the sleeve I1 runs idly. When the clutch system 20 is moved -to its other extreme position first speed is obtained, the drive then being taken directly from the sleeve I1 to the driven shaft whilst the intermediate shaft runs idly.

The over-running clutch 2| may be adapted t0 be manually controlled, taking, for example, the form of a dog clutch which canlbe automatically released when overrunning is desirable, as herer inaf ter described.

Obviously, by changing 'the ratios of the gear- 1 pairs, the train previously referred to as giving second speed" may in point of fact give third speed, and vice versa. In this event. of course,`

`when in the left-hand position the gear 24 is disconnected therefrom.

Throughout these figures the reference characters Rf |,2,- I and 4, inserted at different places,

refer to the reverse drive andthe four different speeds, respectively. By means of these characters and the-accompanying arrows and lines the' operation of the device can be more easily followed.

The change-speed mechanism itself essentially works in the manner of that of Figure 1. The clutching system II.' however, is replaced lby the clutching system illustrated, and this system takes the place of the main clutch of the vehicle and is under the control of the clutch pedal 2B. Both the clutching systems are in this case hydraulically operated.

Special features of the system II herein ilmy co-pending British patent application No. 33,216/34.

In Figures 2 to 8, inclusive, there is disclosed a means whereby the clutches associated with the gear trainv may be hydraulically actuated, the hy-v spaced apart notches 42h in which a ball-43a,y

which is spring-pressed, is adapted l to engage. The rod 42 has an arm 44h secured thereto carrying a toothed rack 44a engageable with a pinion 44 which is rotatable and slidable on a shaft 44e (Fig. 3).

lustrated are described in the specification of A crank arm 4l has one portion thereof engaged with the grooved pinion 44, and another arm engaged with a slide valve 4I. A clutch op` port 41 which is adapted to be connected to a suitable source of pressure supply. The fluid from the inlet port 41 is adapted to pass through the valve 46, through a port 4l and thencer through port 48 into the cylinder ,l0 at one side of the piston II. On the other strokeof the valve 46 the fluid will pass through the port Il, and port 84 into the cylinder l0 on the opposite side of the piston li. The fluid is exhaustedv through the valve 4B on one stroke of the piston II when the exhaust port II vregisters with the port 40. The

fluid will exhaust from the valve 46 through the Y port l2. On the other stroke of the piston III the fluid will exhaust through4 the ports Il, 88 and 81.

Movement of the piston 5| is adapted to rock the lever B2 which is operatively connected to the friction clutch 20. When the piston 5| moves under the action of the fluid entering the ports 48 the lever l2 is rocked to eil'ect clutching of the sleeve I1, and movement of thefpiston 5| in the opposite direction is adapted to effect clutching of the shaft Il. It will of course be understood that the clutch 20 is splined on the driven shaft Ill.

A horizontally swingablelever 4| is disposed forwardly of the selectin'g'rod 42 and is provided with a pair of spaced apart pins I4 at its rear end between which pins a lever rocking member 53 engages. This. member 53 is carried byM the forward end of the rod 4l.' 'I'he other or forward end of the lever 4| is provided with a'plurality of spaced apart teeth il, 40, and 14, and a pluy rality of notches or grooves 39 between these teeth. A pair of L-shaped crank arms 33a and, 33h are rockably mounted on a shaft 36, and one leg 39 of each of the crank arms 33a and 33h is disposed in dependent relation and confronts the forward end of the lever 4I. y

A clutch pedal 28 is provided which is adapted to be depressed by a foot, and a link 29 connects the clutch pedal 28 with a lever 3I which is rockable on the shaft .30 and disposed between the crank arms 33a and 33h for engagement'with confronting lugs 32 carried by the horizontal or upper leg of each of these crank arms 33a and. 33h, as shown in Fig. 4.

A pair of plungers 34a and 34b are slidable in suitable cylinders or housings, and the upper ends of these plungers are connected to the forward ends of the crank arms 33a and 33h, respectively. Springs 35 engage the upper ends of the'plungers 34a and 34h. The plunger or valve 34a has a peripheral groove 51, which upon downward movement of the valve 34a is adapted to register with an intake port 56 and an outletport or passage 58, which in turn communicates with a fluid passage 59 discharging in the space 36 at one side of a piston 38 which is secured as by a` shaft 60 to a drive plate 6I. The valve 34h has a peripheral groove 16 which, upon downward movement of the valve 34h, is adapted to likewise register with the inlet port 56 and a passage 11. The passage 11 communicates with an axial passage 18 in the drive shaft I4 and this passage 16 discharges on the opposite side of the clutch operating piston 38 in the space 31.

The drive plate 6I has a plurality of rods 62 secured thereto, and a clutching means 19 is splined on the shaft I3 between plates 64 and 86.

v A second clutching means 61 is disposed between plates 64 and 66, and this second clutching means 61 is splined on the sleeve I6.

The gear 24- is coupled with the gear 21 by means of a laterally slidable clutch 2'Ia disposed between the gears 24 and 21. 'Ihis clutch 2Ia is operated by means of a rock arm 16 having one end thereof engageable with a cam 68, 69, 15 (Fig. 5) and the otherv end engageable with a fork 1I which loosely engages the clutch 2Ia.v A reversing gear structure 92 is provided which is put in operation by lateral sliding movement of the pinion 44 under the action of partial rotation of the rod 43 so as to couple the two portions 89 and'90 'of a dental clutch (Fig. 3) associated with a suitable rock lever means for shifting the gear On depression of the clutch pedal 28 the rod 29 is pulled downwardly and the shaft 30 rotated clockwise (Figure 2). This raisesvthe crank 3| into contact with the lugs 32 on Vthe rocking levers 33a, 33h supported upon the shaft 30 and causes the rotation of these rocking levers slightly clockwise. This raises the plunger valves 34a, 34h against the pressure of the return springs 35 slightly above the open positions which are actually illustrated. In these conditions the spaces 36, 31 on opposite sides of the piston 38 are connected with the exhaust, allowing the .piston to take up an intermediate position and jthus to free the double-acting clutching system I9, as hereinafter described. At the same time the tail ends 39 of the rocking levers 33a, 33h are moved clear of the teeth 46 in the rocking lever 4I which is journailed at 42 for movement about a vertical axis.

The arrangement and disposition of the parts will best be understood, it is believed, from a description of the operation of the mechanism. `If

I assume that the change-speed lever is inthe neutral position marked N in Figures 2, 3 and 8, asis actually illustrated, and that rst speed is to be engaged, the lever must first be moved to the 5 right (Figures 3 and 8), rotating the operating rod 43 clockwise slightly (Figure 3). 'Ihis rod is rotatable and axially slidable, the spring-pressed ball 43a co-acting with the grooves 43h therein in a well understood manner, but is located against lateral movement. Rotation of the shaft as mentioned slides the grooved pinion 44 to the left in Figure 3 and downwardly in Figure 4, thus rotating the bellcrank lever 45 counter-clockwise (Figure 4) and sliding the slide valve 46 to the left. Oil under pressure entering by the port '41 passes through the port 48 and the port 49 into the lefthand end of the cylinder 50, thus driving the plunger 5I to the right (Figures 2 and 4). 'I'his rocks the lever 52 clockwise (Figure 2) and slides -20 the movable element of the clutching system 26 to the left to effect a direct connection between the sleeve I1 and the driven shaft I5, as is necessary for iirst speed When the gear lever is moved forwardly into 25 the first speed position-tothe left in Figure 2-the operating rod 43 is drawn'to the right. The other end of the operating rod has a bent part 53 loosely engaged between pins 54v on the rocking lever 4 I, and it will be evident that move- 30 ment of the operating rod to the right will rotate the rocking lever 4I clockwise (Figure 4), moving the tooth 55 to a position above (Figure 4) the associated rocking lever 33a. Movement of this kind can only be effected, however, when the 35 rocking levers 33a, 33h have been moved clear of the teeth of the rocking lever 4I as is effected by depression of the main clutch pedal 26.

.On the release of the main clutch pedal the springs 35 return the plunger valves 34a, 34b as far as possible. The plunger valve 34h engaged with the rocking lever 33h cannot return beyond the position illustrated, owing to the rocking lever 33h engaging with the middle tooth of the rocking lever 4I. As the lower rocking lever 33a is clear of lthe tooth 55, however, the l associated valve plunger 34a responds fully to* the pressure of the spring 35. In the operative position thereof oil 'supplied to the inlet 56 enters the groove 51 (Figure 1) and passes from there by the bore 58 to the bores 59, thus supplyling the space 36 with oil under pressure and forcing the'piston 36 to the right (Figure 2). Fast on the stem 60 of the piston is the driving plate 6I carrying the driving pins 62. Movement of these to the right compresses the springs 63 against the presser plate 64. By this means the driven plates 61, which are slidiigly splined on the sleeve I6, are clamped between the presser plate 64 and the driving plate 66 and the drive is thus transmitted from the driving shaft I4 to the sleeve I6.

The sliding movement of the operating rod 43- to the right'also .effects rotation of the grooved pinion- 44 clockwise (Figures 2 and 5). From Figure 5 it will be seen that such rotation causes the concentric portion 66 of the cam 69 to revolve against the rocking lever 1I), which thus remains stationary. The rocking lever 10 is en- 7o gaged with the striking fork 1I through which the slidable clutch member 2Ia is movable. Thus, when engaging ilrst speedf this'slidable clutch member is -not moved but remains in the position illustrated in Figure 2.

-pedal effects the raising of the plunger valve 34a as described and the space 36 then exhausts along the bores 59, the passage 56 ,and the bore .12 to the space 13 communicating with the lnterior-of the crankcase or elsewhere. This returns the clutch system I9 to the neutral position and, of course, disconnects the drive-i. e., before the gear lever is moved.

On moving the gear vlever from theflrst to the second speed" position the operating rod 43 is moved fully to the left (Figures 2 and 4) and in so moving the rocking lever v 4I is rocked counter-clockwise (Figure 4) to carry the tooth 14 below the associated rocking lever 33b and to align the middle notch with the rocking lever 33a. As no rotary movement is given to the operating rod 43 the grooved pinion 44 is not slid but it is rotated counter-clockwiseA (Figure 2) by the sliding motion of the operating rod. Counter-clockwise movement, it will be seen from Figure 5, causes the eccentric portion 15 of the cam 69 to engage the rocking lever 10 and move it clockwise, thus sliding the striking fork 1I to the left to free the clutch 2Ia. The slide valve 46, however, is not moved and the clutching system 2D thus remains in the position occupied by it for first speed, i. e., interconnecting the sleeve I1 with the driven shaft I5.

On release of the clutch pedal the rocking lever 33h is able to move freely clear of the rocking lever 4I under the pressure of the appropriate' spring 35, whilst the plunger valve 34h is depressed. Oi-l entering by the port 66 then flows by way of the groove 16 (Figure 7) along the passage 11 to the bore 18, whence it is delivered to the space 31, thus driving the pistonm36 to th left (Figure 2). Movement of the pins 62 to the left biases the springs against the presser plate 64 whilst relieving the latter of the pressure of the springs 63, and thus the driven clutch discs 19, which are slidably splined upon the intermediate shaft I3, are clamped between the presser` i plate 64 and the driving plate 66."- This effects tral position out of the second speed position.

When moving through the gate the operating rod 43 is rotated counter-clockwise (Figure 3), thus sliding the grooved pinion 44 upwardly (Figure 4). This rotates the bellcrank 45'clockwise and slides the slide valve 46 to the right. The pressure at the left hand end of the cylinder 59 then exhausts by way of the ports 49, the ports 48 and the port Si to the exhaust pipe 62 leading to the crank chamber or elsewhere, and at the same time the incoming oil ventering through the port 41 passes through the port 63 and the ports 64 to the right-hand end (Figure 2) of the cylinder 59, ti'ius forcing the piston 5I position. That is to say, the rocking lever'16 (Figure 5) again abuts the concentric portion 66 ofthe cam 69, allowing the striking fork 1I to be returned to effect engagement of the clutch 2 Ia under the pressure of the spring 66. The oil from the space 31 is exhausted by the bore 16,.

the passage 11 to the space 13.

When changing from third to fourth "speed" the operating rod 43 will not be rotated and theslide valve 46 will not, therefore, be moved. The operating rod, however, will be shifted to the left (Figure 2), thus effecting the clamping of the driven plates 19 between the driving plate 60 l and the presser plate 64, as previously described.

whilst oil in the space 36 exhausts along the 4) of the pinion 44 (with the parts carried thereby) brings the raised portion 66 of the cam 69 into alignment with. the rocking lever 16. Consequently, when the operating rod 43 is slid to the yright (Figures 2 and 5) and the-cam 69 is rotated clockwise, the clutch 2Ia will be released. The full movement ofA the gearleverv to the right (Figures 3 and 8) also slides the dogs 89 into ymesh with corresponding recesses 96 on the disc 9I'- (Figure 6) and on the sliding of the rod 43 andthe consequent rotation of the disc 9|, the

' double reverse gear 92 is slid Vagainst the pressre of the return spring 93, i. e., to the left in Figure 2, thus interconnecting the gear 24 with the gear 23. When the clutch pedal 26 is released the drive is taken from the driving shaft I4 directly to the sleeve I6, thence by thegear pair 22, 24 to the double reverse gear 92, and thence to the gear 23 on the sleeve I1 which is `tiiermore the full downward movement (Figure directly connected .to the driven shaft I5. The v intermediate shaft is in these conditions driven idly from the gear 23 by the gear 25 and the gear pair 21, I8. v

The cam member'66, 69, 15 is fixed to the shaft 44e at one side of the pinion 44 and the clutch element 69 is fixed to this shaft 44e on the opposite side of the vpinion 44. In Fig. 3, movement of the pinion 44 to the right by partial rotation of the selector 43 will effect engagement of the lever 10 with the cam, and the particular cam portion is selected by longitudinal movement of the selector 43 which will in turn rotate the pinion 44 and thereby bring the desiredcam portion into action with respect to the lever 10. The different cam portions are clearly illustrated in Fig. 5.

Rotation oi' the selector 43 in the opposite direction, or to the left in Fig. 3 will effect engagement of the clutch element 69 with the clutch element -9I, and longitudinal movement of the selector 43-wiil then rock the lever 94 which is connected by 'a link 95 to the clutch element lill-9|. Rocking of the lever 94 will slide the gears 92a and 92h into engagement with the gears 24 and 25, respectively.

By means of the invention the, three constantly-meshed gear-pairs are arranged close to one manner so that silence in running can be obtained. Silent engagement can be ensured when any of the four forward speeds is being introduced. Owing to the absence of, any independent main clutch manufacture and assembly can be inexpensively carried out. Moreover, the

voverall size of the transmission and change-speed mechanism, owing to the grouping of the gearpairs beside one another, compares favourably with that of equivalent mechanisms in presentday motor-vehicles.

What I claim as my invention and desire to secure by Letters Patent of the United States 1. A change speed mechanism comprising a drive shaft, a driven shaft, an intermediate shaft coaxial with said drive shaft and said driven shaft, a gear fixed on the intermediate shaft between the ends thereof, a pair of sleeves loose on the intermediate vshaft .one on eachside of said intermediate gear, a gear on the end of each f secured to the drive shaft, a movable clutch ele' ment secured to the driven shaft, a lay shaft parallel with the intermediate shaft, a gear xed 'to the lay shaft and meshing withthe intermediate gear, a second gear fixed to said lay shaft meshing with the gear of one ofl said sleeves, a loose gear on the lay shaft meshing with the gear of the other sleeve, clutch means for coupling said loose gear with said lay shaft, a selector means for movingv the driven shaft clutch element into engagement with the adjacent clutch element of one` of the sleeves or the intermediate shaft, means for moving the drive shaft clutch element into engagement with the adjacent clutch element of the other sleeve or the intermediate shaft, and means carried by said selector means whereby to determine the clutching engagement of the drive shaft clutching element. r

2. A change speed mechanism comprising `a drive shaft, a driven shaft, an intermediate shaft coaxial with said drive shaft and said driven" shaft, a gear fixed on the intermediate shaft between the ends thereof, a pair of sleeves loose on the intermediate shaft one on each side of said intermediate gear, a gear on the end of each sleeve adjacent said intermediate gear, a clutch element on the opposite end of each sleeve, a clutch ele'- mediate shaft, a movable clutch element secured ment secured to the opposite ends of the interto the drive shaft, a movable clutch element j secured to the driven shaft, each of said movable clutch elements including a toothed clutching means and a frictional clutching means, said first and second clutch element also including a toothed clutching means and africtional clutching means, a lay shaft parallel with the intermediate shaft, a gear xed to the lay shaft and meshing with the intermediate gear, a second gear fixed to said-lay shaft meshing with the gear of one of said sleeves, a loose gear ori the lay shaft meshing with the gear on the other sleeve, clutch means for coupling said loose gear with said lay shaft, a selector meansfor moving the driven shaft clutch element into engagement with the adjacent clutch element of one of the sleeves or the intermediate shaft means for moving the drive shaft clutch element into engagement with the adjacent clutch element of the other sleeve or the intermediate shaft, and means carried by said selector means whereby to determine the clutching engagement of the drive shaft clutchshaft, a gear fixed on the intermediate shaft between the ends thereof, a pair of sleeves loose on the intermediate shaft one on each side of said intermediate gear, a gear on the end of each sleeve adjacent said intermediate gear, a clutch element on the opposite end of each sleeve, a clutch element secured to the opposite ends of the intermediate shaft, a movable clutch element secured to the drive shaft, a movable clutch element secured to the driven shaft, a lay shaft parallel with theintermediate shaft, a gear xed to'the lay shaft and meshing with the intermediate gear, a second gear, fixed to said lay shaft meshing with the gear of one of said sleeves, a loose gear on the lay shaft meshing with the gear of the other sleeve, clutch means for coupling said loose gear with said lay shaft, a selector means,

fluid operated clutch operating means connected shaft.

i PERCY mmv. 

